Lets you do a Sleep Stomp. Uses 2 FP. If it works the enemy Mario jumps on falls asleep for a bit.­

The Thousand-Year Door Description

Wear this to use Sleepy Stomp. 2 FP are required to use this attack, which can make enemies sleep if executed superbly. Wearing two or more of these badges requires more FP for the move, but enemies stay asleep for longer.

Sleepy Stomp, originally known as Sleep Stomp, is a badge in Paper Mario and Paper Mario: The Thousand-Year Door. In Paper Mario, it can be bought from Rowf and Rhuff's badge shop for in Toad Town for seventy-five coins. In Paper Mario: The Thousand-Year Door, it is the reward for reaching the tenth floor of the Pit of 100 Trials, can be bought from the Lovely Howz of Badges for seventy-five coins, and can rarely be dropped after a battle against Fuzzies, Dark Puffs, and Boos. If Mario is equipped with it, he gains access to the Sleepy Stomp move (Sleep Stomp in Paper Mario), a jump attack that costs two FP. The move acts like the standard jump attack, but the target of the attack has a chance of being afflicted with the Sleepy status (dependent on the enemy; some enemies always fall asleep, while others are immune to it), which makes them fall asleep for five turns. Wearing multiple copies of the badges increases the amount of FP required to use the move, but also increases how long the enemy stays asleep.